About JWT Decoder
JSON Web Tokens (JWT) are a compact, URL-safe way to represent claims between two parties. They are the standard for API authentication, OAuth 2.0, and session management in modern web applications. This tool decodes any JWT and displays the header, payload, and individual claims in a readable format. Useful for debugging authentication flows, verifying token contents, and understanding token structure.
How to Use
- Paste your JWT token into the input field.
- Click "Decode" to parse the token.
- View the decoded header and payload with all claims.
Key Features
- ✓ Decode JWT header and payload
- ✓ Display all standard and custom claims
- ✓ Show expiration and issued-at timestamps
- ✓ Validate token structure
Common Use Cases
- • Debugging OAuth 2.0 authentication flows
- • Inspecting API access tokens
- • Verifying JWT claims and expiration
- • Learning JWT structure and standards
Frequently Asked Questions
What is a JWT token?
A JSON Web Token (JWT) is a compact token format consisting of three Base64-encoded parts: header, payload, and signature, separated by dots. It is used for securely transmitting information between parties.
Can this tool verify JWT signatures?
This tool decodes and displays the token contents. Signature verification requires the signing key, which is not needed for inspection.
Is it safe to paste my JWT here?
Yes. The token is processed server-side within your session and is not stored or logged. However, never share production tokens with untrusted services.
What claims are shown?
All claims in the payload are displayed, including standard claims like iss (issuer), exp (expiration), sub (subject), and any custom claims.